Geomechanical Substantiation of Technology Parameters for Extraction of Mineral Reserves under Open Pit Bottom at Steeply Dipping Ore Bodies of Small and Medium Thickness
A. O. Kudrya, M. V. Kurlenya, A. A. Neverov
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: Reserves under open pit bottom, mining system, thickness, ore body, stope, pillar, rubble concrete, rock, backfill, parameters of structural components of mining, stresses, stability, strength, safety
Abstract
The article studies a mining system with stoping under open pit bodies at steeply dipping ore bodies of small and medium thickness using rubble concrete and dirt fill as ground control. The technology assumes upward mining on the levels at the total downward sequence of stoping. The limit variant of stoping in various geomechanical conditions is studied for a geotechnical situation of mining on three levels including two mined-out levels. The mining system parameters are substantiated using 3D FWEM-based mathematical stress-strain modeling. The dependence is revealed between the geotechnology parameters and the stress behavior, and between the stability of rocks in the structural components of mining and in adjacent rock mass. The areas of possible rock fracture are identified. The safety of the mining system is governed by the integrity of rubble concrete pillars and by the stability of the crown pillar.
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